Hebrew is a language, not a country. Hebrew is spoken by over 6 million people in Israel. The capital city of Israel is Jerusalem.
Jerusalem, Israel.
Jerusalem
Jerusalem (ירושלים)
King David. Before that, Jerusalem was a Jebusite stronghold.
There were a number of different Ancient Israelite and Judean capital cities, such as Gibeah, Hebron, Jerusalem, Shiloh, Samaria, etc. Additionally, the Kingdom of Israel and the Kingdom of Judah were two separate countries which (naturally) each maintained a distinct capital.
The Hebrews' military was an army composed of Hebrews.
Yes, there were Hebrews in the Book of Judges. The Book was also written by Hebrews.
David was one of the Kings of the Hebrews.
The term "Hebrews" is used in the New Testament to refer to the Jewish people. It was used to distinguish Jewish believers from Gentile believers. So, yes, Hebrews were mentioned in the New Testament.
In the Hebrews time his nickname was "Father of the Hebrews"
The Hebrews are considered as Gods own people.
Yes, the Hebrews had many many wars.
No. The Hebrews worship only God. It is forbidden for the Hebrews to worship men or engage in Human sacrifice.